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I have had a statistical look at the All Blacks performance in the lead up(between) to Rugby World Cups and the results were interesting to say the least. I have first used Bledisloe Cup or Tri nations matches in black. Then total internationals (except RWC matches) in red and beside the RWC year in blue is how many games they won is that RWC.
In the lead up to RWC 87 6/6
The All Blacks won 2 and lost 2 and won the RWC.
1984-1987 - 39/42 or 93%
In the lead up to RWC 91 5/6
The All Blacks won 7, lost 2 and drew 1.
1988-1991 - 53/58 or 91%
In the lead up to RWC 95 5/6
The All Blacks won 4 and lost 3.
1992-1995 - 44/55 or or 80%
In the lead up to RWC 99 4/6
The All Blacks won 12 and lost 6.
1996-1999 - 36/45 or 80%
In the lead up to RWC 03 6/7
The All Blacks won 11 and lost 5
2000-2003 - 30/40 or 75%
So far in the lead up to RWC 07
The All Blacks have won 9 and lost 4 so far with 4 to play.
2004-2005 - 29/33 or 88%